CN109115628A - A kind of method for estimating stability of drilling fluid to rock stratum - Google Patents
A kind of method for estimating stability of drilling fluid to rock stratum Download PDFInfo
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- CN109115628A CN109115628A CN201810839486.6A CN201810839486A CN109115628A CN 109115628 A CN109115628 A CN 109115628A CN 201810839486 A CN201810839486 A CN 201810839486A CN 109115628 A CN109115628 A CN 109115628A
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- core block
- drilling fluid
- rock stratum
- rock
- stability
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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Abstract
The invention belongs to petroleum drilling technology fields, and in particular to a kind of method for estimating stability of drilling fluid to rock stratum.The present invention enters core block true in stratum in different fluid, and the rolling of certain time is carried out under conditions of the required temperature and pressure reached, stablize the power of rock stratum ability come underground different fluid when simulating drilling well, as stability is poor, then rock block directly bursts apart during scrolling, as stability is stronger, then core block remains intact, the core block remained intact press machine is tested into compression strength, then compression strength is bigger for the stronger core block of stability, and strong and weak to evaluate the ability of the stable rock stratum of different fluid according to the intensity of pressure.Process of the present invention is simple, strong operability, experimental period are short；Not only close to the actual conditions of the true rock stratum in stratum, but also high-temperature high-pressure state can be simulated, underground situation of the evaluation effect closer to reality；Experimental result combines the evaluation method of data and phenomenon in kind, highly promotes and applies.
Description
Technical field
The invention belongs to petroleum drilling technology fields, and in particular to a kind of estimation of stability side of drilling fluid to rock stratum
Method.
Background technique
Guarantee that rock stability is one of most important work of oil drilling.When the ability that drilling fluid stablizes rock stratum is weaker
When, rock stratum will unstability collapse, thus the lasting progress for hindering drilling well to work, therefore when carrying out oil drilling, it is necessary to
Reinforce drilling fluid to the stability of rock stratum, it is ensured that wellbore construction is normally carried out.
Indoors to the evaluation of the mud stone stability of different fluid, can targetedly be instructed to site operation, surely
Determine rock stratum, guarantees being normally carried out for wellbore construction.Currently, the evaluation method for carrying out mud stone stability is more, such as artificial rock core
Swell increment experiment is surveyed by, come simulation wellbore hole rock core, and being dipped in fluid to be evaluated with the bentonite rock core artificially suppressed
Measure the expansion elongation of rock core." oilfield chemistry " the 4th phase in 1999 " broken formation anti-caving agent for drilling fluid evaluation method and answers
With " in propose to use a kind of high temperature and pressure dynamic filter press, using artificial core, the envelope of mud cake is determined by measurement filter loss
Stifled ability, test rock core cannot be reused.
The shortcomings that these technologies or deficiency are: the rock core 1. used is all the reality of artificial core and down-hole formation substantially
Situation otherness increases, cannot the more objective truth for reacting stratum；2. the instrument used is complicated, experimental procedure is cumbersome, real
It tests that the time is long, Fast Evaluations cannot be carried out to a large amount of different fluids in a short time；3. experimental result is not intuitive, evaluation result
Only data, convincingness be not strong.
Summary of the invention
The purpose of the present invention is to provide a kind of drilling fluids to the method for estimating stability of rock stratum, overcomes in the prior art
There are the problem of, provide technical support for situ of drilling well application.
It is another object of the present invention to provide underground different fluids when a kind of simulation drilling well to stablize the strong of rock stratum ability
Weak method.
Technical solution provided by the invention is as follows:
The natural stratum core block of regular shape is immersed drilling fluid to the method for estimating stability of rock stratum by a kind of drilling fluid
Middle heat rolling, the natural core block compression strength after measuring heat rolling, stabilization of the drilling fluid to rock stratum when compression strength is greater than 10MPa
Property it is high, can be used for the rock stratum drilling well.
A kind of method for estimating stability of drilling fluid to rock stratum, the specific steps are as follows:
The natural core of the same lithology in same stratum is cut into the equal sized square of muti-piece with rock cutter by step 1)
Core block；
Drilling fluid to be evaluated is added in step 2 in ageing can, and muti-piece natural core block is immersed in drilling fluid to be evaluated；
Ageing can sealing is put into roller heating furnace by step 3), and is set and rolled temperature and rolling time；
After the completion of the rolling of step 4) heat, whether the natural core block observed in ageing can has and bursts apart, if any bursting apart, then the brill to be evaluated
Well fluids cannot be used for the rock stratum drilling well；
If natural core block is all intact, then the compression strength of muti-piece natural core block is measured with pressure testing machine, and be averaged
Value, when compression strength is greater than 10MPa, drilling fluid is high to the stability of rock stratum, can be used for the rock stratum drilling well.
When a variety of drilling fluids to be evaluated are evaluated simultaneously, natural core block compression strength is greater than the corresponding drilling well stream of 30MPa
Body drilling fluid corresponding compared to compression strength 10-30MPa is high to the stability of rock stratum, is suitable for the rock stratum drilling well.
The size of the square core block is 1 × 1cm ~ 5 × 5cm.
Rolling temperature for straight sieve group formation rock stone is 80 DEG C, and rolling time is 16 hours.
Rolling temperature for extension group formation rock stone is 100 DEG C, and rolling time is 16 hours.
Rolling temperature for the peak Shi Qian and Shihezi Formation formation rock stone is 120 DEG C, and rolling time is 16 hours.
The rock cutter is QG-2 type Metallographic Specimen Cutting Machine；The roller heating furnace is that CGRL-4A type roller adds
Hot stove；The pressure testing machine is OWC-002 type field pressure testing machine.
The equal sized square core block of muti-piece is four pieces or more.
The beneficial effects of the present invention are:
The present invention enters core block true in stratum in different fluid, and in the condition of the required temperature and pressure reached
The lower rolling for carrying out certain time, stablizes the power of rock stratum ability come underground different fluid when simulating drilling well, if fluid stable
Property is poor, then rock block directly bursts apart during scrolling, if the stability to rock stratum is stronger, core block is remained intact,
The core block remained intact is continued to test compression strength with press machine, then compression strength is bigger for the stronger core block of stability,
And it is strong and weak to evaluate the ability of the stable rock stratum of different fluid according to the intensity of pressure.
Experimentation of the present invention is simple, strong operability, experimental period are short；Both close to the practical feelings of the true rock stratum in stratum
Condition, and high-temperature high-pressure state can be simulated, underground situation of the evaluation effect closer to reality；Experimental result combines data and reality
The evaluation method of object phenomenon, highly promotes and applies.
It will be described in further details below.
Specific embodiment
Embodiment 1:
A kind of drilling fluid is present embodiments provided to the method for estimating stability of rock stratum, by the natural stratum rock core of regular shape
Block immerses heat rolling in drilling fluid, the natural core block compression strength after measuring heat rolling, drilling well stream when compression strength is greater than 10MPa
Body is high to the stability of rock stratum, can be used for the rock stratum drilling well.
The principle of the invention:
Core block true in stratum is entered in different fluid, and is carried out under conditions of the required temperature and pressure reached
The power of rock stratum ability is stablized in the rolling of certain time come underground different fluid when simulating drilling well, if fluid stability is poor,
Then rock block directly bursts apart during scrolling, if the stability to rock stratum is stronger, core block is remained intact, and will keep
Good core block continues to test compression strength with press machine, and then compression strength is bigger for the stronger core block of stability, and according to pressure
Power intensity is strong and weak come the ability for evaluating the stable rock stratum of different fluid.
Embodiment 2:
On the basis of embodiment 1, a kind of drilling fluid is present embodiments provided to the method for estimating stability of rock stratum, it is specific to walk
It is rapid as follows:
The natural core of the same lithology in same stratum is cut into the equal sized square of muti-piece with rock cutter by step 1)
Core block；
Drilling fluid to be evaluated is added in step 2 in ageing can, and muti-piece natural core block is immersed in drilling fluid to be evaluated；
Ageing can sealing is put into roller heating furnace by step 3), and is set and rolled temperature and rolling time；
After the completion of the rolling of step 4) heat, whether the natural core block observed in ageing can has and bursts apart, if any bursting apart, then the brill to be evaluated
Well fluids cannot be used for the rock stratum drilling well；
If natural core block is all intact, then the compression strength of muti-piece natural core block is measured with pressure testing machine, and be averaged
Value, when compression strength is greater than 10MPa, drilling fluid is high to the stability of rock stratum, can be used for the rock stratum drilling well.
The size of the square core block is 1 × 1cm ~ 5 × 5cm.
The rock cutter is QG-2 type Metallographic Specimen Cutting Machine；The roller heating furnace is that CGRL-4A type roller adds
Hot stove；The pressure testing machine is OWC-002 type field pressure testing machine.
Embodiment 3:
On the basis of embodiment 2, the present embodiment measures 3 kinds of drilling fluids to the stability of the rock core on extension group stratum simultaneously,
Specific step is as follows:
Example 1:
1. the rock core on extension group stratum is cut into the core block of 3cm × 3cm, and it is numbered, compiling respectively is core block A1, rock
Heart block A2, core block A3, core block A4, core block A5, core block B1, core block B2, core block B3, core block B4, core block
B5 and core block C1, core block C2, core block C3, core block C4, core block C5；
2. taking drilling fluid A, drilling fluid B and each 400mL of drilling fluid C to be added in ageing can respectively, then respectively by rock core
Block A1, core block A2, core block A3, core block A4, core block A5 immerse in fluid A；Core block B1, core block B2, core block
B3, core block B4, core block B5 immerse in fluid B；Core block C1, core block C2, core block C3, core block C4, core block C5
It immerses in fluid C；
3. ageing can is sealed, ageing can is put into roller heating furnace, by the temperature setting of heating furnace at 80 DEG C, rolling time is set
It is set to 16 hours；
4. removal of core block, core block A1, A2, A3, A4, A5, B2, B3 and B4 have burst apart respectively after heat rolling, core block C1,
C2, C3, C4, C5 are still intact, and core block C1, C2, C3, C4, C5 are put into pressure testing machine, carry out intensity of pressure test.
Experimental result and analysis:
Core block after drilling fluid A and drilling fluid B are rolled has and bursts apart, and illustrates both fluids to extension group rock stratum
Stability is bad, is not suitable for scene and uses；The mean compressive strength of core block after drilling fluid C rolling is 15.2MPa, explanation
Drilling fluid C is preferable to the stability of extension group rock stratum, and scene is suitble to use.
Embodiment 4:
On the basis of embodiment 2, the present embodiment measures four kinds of fluids to the stability of the rock core on Shihezi Formation stratum, tool simultaneously
Steps are as follows for body:
1. the rock core on Shihezi Formation stratum to be cut into the core block of 3cm × 3cm, and be numbered, respectively compile be core block A1,
Core block A2, core block A3, core block A4, core block A5, core block B1, core block B2, core block B3, core block B4, rock core
Block B5, core block C1, core block C2, core block C3, core block C4, core block C5 and core block D1, core block D2, core block
D3, core block D4, core block D5.
2. drilling fluid A, drilling fluid B, drilling fluid C and each 400mL of drilling fluid D is taken to be added to ageing can respectively
In, then respectively immerse core block A1, A2, A3, A4, A5 in drilling fluid A；Core block B1, B2, B3, B4, B5 immerse drilling well stream
In body B；Core block C1, C2, C3, C4, C5 immerse in drilling fluid C；Core block D1, D2, D3, D4, D5 immerse drilling fluid D
In.
3. ageing can is sealed, ageing can is put into roller heating furnace, by the temperature setting of heating furnace at 120 DEG C, is rolled
Time is set as 16 hours；
4. after heat rolling, removal of core block respectively, core block A2, A3, A4 and B5 burst apart, core block C1, C2, C3, C4, C5,
D1, D2, D3, D4, D5 are still intact, and intact core block C1, C2, C3, C4, C5, D1, D2, D3, D4, D5 are put into pressure examination
Machine is tested, intensity of pressure test is carried out.
Experimental result and analysis:
Core block after drilling fluid A and drilling fluid B are rolled has and bursts apart, and illustrates both fluids to Shihezi Formation rock stratum
Stability it is bad, be not suitable for scene use；The mean compressive strength of core block after drilling fluid C and drilling fluid D rolling
Respectively 13.6MPa and 21.1MPa illustrates that both drilling fluids are suitable for live use, but the use of drilling fluid D is imitated
Fruit is more preferably.
Experimentation of the present invention is simple, strong operability, experimental period are short；Both close to the practical feelings of the true rock stratum in stratum
Condition, and high-temperature high-pressure state can be simulated, underground situation of the evaluation effect closer to reality；Experimental result combines data and reality
The evaluation method of object phenomenon, highly promotes and applies.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.The test that embodiment does not describe in detail
The common knowledge or conventional means of the method category industry, do not describe one by one here.
Claims (9)
1. a kind of drilling fluid is to the method for estimating stability of rock stratum, it is characterised in that: by the natural stratum rock core of regular shape
Block immerses heat rolling in drilling fluid, the natural core block compression strength after measuring heat rolling, drilling well stream when compression strength is greater than 10MPa
Body is high to the stability of rock stratum, can be used for the rock stratum drilling well.
2. a kind of drilling fluid according to claim 1 is to the method for estimating stability of rock stratum, which is characterized in that specific step
It is rapid as follows:
The natural core of the same lithology in same stratum is cut into the equal sized square of muti-piece with rock cutter by step 1)
Core block；
Drilling fluid to be evaluated is added in step 2 in ageing can, and muti-piece natural core block is immersed in drilling fluid to be evaluated；
Ageing can sealing is put into roller heating furnace by step 3), and is set and rolled temperature and rolling time；
After the completion of the rolling of step 4) heat, whether the natural core block observed in ageing can has and bursts apart, if any bursting apart, then the brill to be evaluated
Well fluids cannot be used for the rock stratum drilling well；
If natural core block is all intact, then the compression strength of muti-piece natural core block is measured with pressure testing machine, and be averaged
Value, when compression strength is greater than 10MPa, drilling fluid is high to the stability of rock stratum, can be used for the rock stratum drilling well.
3. a kind of drilling fluid according to claim 1 is to the method for estimating stability of rock stratum, it is characterised in that: it is a variety of to
When appraisal drilling fluid is evaluated simultaneously, natural core block compression strength is greater than the corresponding drilling fluid of 30MPa compared to pressure resistance
It is high to the stability of rock stratum to spend the corresponding drilling fluid of 10-30MPa, is suitable for the rock stratum drilling well.
4. a kind of drilling fluid according to claim 2 is to the method for estimating stability of rock stratum, it is characterised in that: it is described just
The size of cube core block is 1 × 1cm ~ 5 × 5cm.
5. a kind of drilling fluid according to claim 2 is to the method for estimating stability of rock stratum, it is characterised in that: for straight
The rolling temperature of sieve group formation rock stone is 80 DEG C, and rolling time is 16 hours.
6. a kind of drilling fluid according to claim 2 is to the method for estimating stability of rock stratum, it is characterised in that: for prolonging
The rolling temperature of long group formation rock stone is 100 DEG C, and rolling time is 16 hours.
7. a kind of drilling fluid according to claim 2 is to the method for estimating stability of rock stratum, it is characterised in that: for stone
The rolling temperature of thousand peaks and Shihezi Formation formation rock stone is 120 DEG C, and rolling time is 16 hours.
8. a kind of drilling fluid according to claim 2 is to the method for estimating stability of rock stratum, it is characterised in that: the rock
Stone cutting machine is QG-2 type Metallographic Specimen Cutting Machine；The roller heating furnace is CGRL-4A type roller heating furnace；The pressure examination
Testing machine is OWC-002 type field pressure testing machine.
9. a kind of drilling fluid according to claim 2 is to the method for estimating stability of rock stratum, it is characterised in that: muti-piece ruler
Very little equal square core block is four pieces or more.
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| CN201810839486.6A CN109115628A (en) | 2018-07-27 | 2018-07-27 | A kind of method for estimating stability of drilling fluid to rock stratum |
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| CN201810839486.6A CN109115628A (en) | 2018-07-27 | 2018-07-27 | A kind of method for estimating stability of drilling fluid to rock stratum |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707016A (en) * | 2012-06-01 | 2012-10-03 | 中国海洋石油总公司 | Evaluation method and device for coating-restraining performance of drilling fluid system |
| CN103510948A (en) * | 2012-06-22 | 2014-01-15 | 中国石油化工股份有限公司 | Test method for predicting well wall stability of gas drilling in brittle rock |
| WO2016159976A1 (en) * | 2015-03-31 | 2016-10-06 | Halliburton Energy Services, Inc. | Uniaxial anisotropy detection apparatus, systems, and methods |
| CN106680106A (en) * | 2017-01-06 | 2017-05-17 | 中国石油大学(华东) | Simulation experiment device and method for mudstone and drilling liquid interaction under stratum conditions |
| CN107179232A (en) * | 2016-03-09 | 2017-09-19 | 中国石油化工股份有限公司 | A kind of method for evaluating shale stability |
-
2018
- 2018-07-27 CN CN201810839486.6A patent/CN109115628A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707016A (en) * | 2012-06-01 | 2012-10-03 | 中国海洋石油总公司 | Evaluation method and device for coating-restraining performance of drilling fluid system |
| CN103510948A (en) * | 2012-06-22 | 2014-01-15 | 中国石油化工股份有限公司 | Test method for predicting well wall stability of gas drilling in brittle rock |
| WO2016159976A1 (en) * | 2015-03-31 | 2016-10-06 | Halliburton Energy Services, Inc. | Uniaxial anisotropy detection apparatus, systems, and methods |
| CN107179232A (en) * | 2016-03-09 | 2017-09-19 | 中国石油化工股份有限公司 | A kind of method for evaluating shale stability |
| CN106680106A (en) * | 2017-01-06 | 2017-05-17 | 中国石油大学(华东) | Simulation experiment device and method for mudstone and drilling liquid interaction under stratum conditions |
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Effective date of registration: 20201029 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: Weiyang road 710018 Shaanxi city of Xi'an province Changqing No. 151 building room 1902 Applicant before: CNPC CHUANQING DRILLING ENGINEERING CO., LTD. CHANGQING WELL DRILLING GENERAL Co. |
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